Correction :

25 - 3 = 22	15 - 2 = 13
8 × 9 = 72	13 + 20 = 33
8 : 1 = 8	29 - 18 = 11
30 - 20 = 10	20 + 7 = 27
10 + 3 = 13	11 - 6 = 5
10 + 9 = 19	11 × 11 = 121
8 : 2 = 4	8 : 1 = 8
9 × 2 = 18	23 - 0 = 23
110 : 11 = 10	110 : 10 = 11
4 + 21 = 25	17 + 6 = 23